/Engine/Source/Runtime/HeadMountedDisplay/Public/IXRSystemAssets.h
These IDs are intended to be used with certain methods to reference a specific device (like withCreateRenderComponent(), etc.). NOTE: that these IDs are NOT interoperable across XR systems (vive vs. oculus, etc.). Using an ID from one system with another will have undefined results.
True if the DeviceList was successfully updated, otherwise false.
bool EnumerateRenderableDevices ( [TArray](API\Runtime\Core\Containers\TArray)< int32 > & DeviceListOut )